Image encoding method, image encoding apparatus, image decoding method, image decoding apparatus, method of transmitting bitstream, and recording medium storing bitstream

A method comprising:

• deriving Supplemental Enhancement Information (SEI) messages for pictures;
• and
• encoding the pictures,
• wherein the SEI messages contain processing order information related to a group of types of the SEI messages.

A method comprising:

• acquiring a bitstream for image information, the bitstream being generated based on operations comprising:
• deriving Supplemental Enhancement Information (SEI) messages for pictures;
• and
• encoding the pictures;
• and
• transmitting data including the bitstream,
• wherein the SEI messages contain processing order information related to a group of types of the SEI messages.